Just like with ousting dictators, that would leave a power vacuum which will be filled ASAP by an equally evil corporation, since Amazon proved what one can get away with.
The solution is to legislate companies with despicable practices out of business, but that ship has sailed some time in the '70s -'80s when globalization and unscrupulous capitalism kicked into fifth gear.
Of course, and "obliterating" Amazon would still leave all the other corporations who behave similarly and the broken system they lay their foundation upon intact.
Still, it is fine to me to express frustration using a childish dream for revenge every once in a while.